Post Offices in South Amboy, New Jersey, United States SearchSearch SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List Laurence Harbor Post Office No Reviews Favorite Fax: (732) 566-8687Phone: (732) 566-7031Retail Hours South Amboy Post Office No Reviews Favorite Fax: (650) 577-5474Phone: (732) 721-0937Retail Hours